Improvement in sewing-machines



3 SheetsSheet 1. G. H. W. CURTIS.

V flewing-Maohine. No. 213,548. Patented Mar. 25, 1879.

",PETERS, PNOTO-LITHUERAPHER, WASHINGTON, u C

3 Sheets-Sheet 2. G. H. W. CURTIS. Sewing-Machine.

aatented Mar. 25, 18 79..

N. PETERS. PHOTO-LITHOGRAPHER, WASHINGTON D C 3 Sheets-Sheet 3,

G. H. W. CURTIS. Sewing-Machine.

Patented Mar. 25, 1879. I

MPETERS, PHOTO-UTNOGRAFHER. WASHINGTON D C UNITED STATES PATENT OFFICE.

GEORGE H. w. CURTIS, E BROOKLYN, NEW YORK, ASSIGNOR TO WHEE-EER wILsONMANUFACTURING COMPANY, OF BRIDGEPORT, CONNECTICUT.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 213,548, dated March25, 1879; application filed January 30, 1878.

To all whom it may concern Be it known that 1, GEORGE H. W. CURTIS, ofBrooklyn, county of Kings, State of New York, have invented a new anduseful Improvement in Sewing-Machines, which is fully set forth in thefollowing specification and accompanying drawings, in which- Figure 1 isa side elevation of my improved machine; Fig. 2, a plan View of the armthereof, with a portion cut away; Fig. 3', a front elevation thereof;Fig. 4, a central section, in part, of the arm, showing interiormechanism; Fig. 5, a fragmentary portion of the same; Figs. 6, 7, 8, 9,10, 11, and 12, detached views of various parts.

The object of my invention is to enable shoefitters to stitch variousseams in shoe-uppers and other articles which could not be stitched on atable machine, such as the boxings after the front and back seams areclosed, or seams in boots after they are made, and a variety of worknecessary to be got at from the inside; and my improvement consists inadapting a rotary hook, straight needle, and a fourmotion feedingmechanism, carrying and stitching work across a tubular arm.

A represents the bed of the machine; B, the main shaft; 0, the tubulararm; D, the fourmotion feed; E, the throat-plate; F, the hookshaft; G,the needle-cam; H, the take-up; I, the needle-bar K, the rotarypresser-wheel; L, the ten sion-Wheel; M, the connectingplate N, thering-slide O, the rotary hook; P, the feed-cam;

the feed-bar. Q is a rightangular projection attached to feed-bar; R,the stitch-regulatin g screw; S, the spiral spring that Secures thering-slide in position; T, the bObbin-sprin g U, the lever to regulateits pressure; V, the pin on which the feed rocks; W, the hook-adjustingscrew; X, the sleeve; Y, the needle-lever; Z, the variable motion disk;1 and 2, the pins thereof; 3, the tension-finger; 4, the tension- Spring; 5, thefeed-spring; 6,thetension-adj usting screw; 7, the presser-footbar; 8 and 9, the collars on the shaft, in which are the variablemotionpins; 10, the tension-pad.

It is not necessary to State in detail the action of the parts common toprevious wellknown rotary-hook machines whereby motion is given to thehook, needle, and feeding mechanism, save as they are peculiar to thismachine.

The main shaft B obtains a variable motion by the action of disk Z andpins 1 and 2 in the shaft-collars 8 and 9 on each side of the disk, toimpart a slower movement to the hook at the time it is entering theloop, and a quick movement when it is casting it off.

The hook-shaft F is connected to the main Shaft B by sleeve X, with aset-Screw, whereby the rotary'hook may be adjusted so that its pointshall reach the loop Sooner or later, as desired.

As the tubular arm for the necessities of shoe-work must be small,'newmeans of op eratin g the feed and tension are required. Feed-cam P liftsfeed D, rocking on pin V, and carries it forward; curved spring 5 bringsit down and back.

What I claim as my invention, and desire to Secure by Letters Patent, is

The Combination of the tubular arm 0, feedbar Q, provided with theright-angled projection Q, cam P, pin V, and spring 5, substantially asand for the purposes set forth.

GEORGE H. W. CURTIS.

Witnesses:

S. J. GORDON, JOHN W. RIPLEY.

